In World War I, Germany deployed U-boats in an attempt to stifle the flow of essential supplies to Britain and other Allied nations, without success.
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German U-boat torpedoes the Lusitania, May 7, 1915 - POLITICO
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Fateful Voyage of the Lusitania
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7 May 1915: German U-Boats Sink The British Ocean Liner Lusitania
Blockades, u-boats and sinking of the Lusitania